Topic starter
28/09/2026 4:05 pm
TL;DR: Linux estates contain far more machine identities than most teams realise, and they often live outside directory governance as service accounts, SSH keys, tokens, and automated agents, according to LinuxGuard. The result is a standing access gap: credentials outlive their purpose, evade review, and can turn a single foothold into lateral movement.
Editorial analysis by NHI Mgmt Group, based on content published by LinuxGuard: “Non-Human Identity on Linux”.
Key questions
Q: What breaks when Linux machine identities are not in the directory?
A: Directory-centric IAM misses service accounts, SSH keys, and tokens created directly on hosts, so access reviews never see the identities that may hold real privilege.
Q: Why do service accounts and SSH keys create such a large lateral movement risk?
A: Because they are reusable machine identities with no natural friction once stolen.
Q: How do security teams know if machine identity governance is working?
A: Look for fewer standing accounts, faster onboarding of automation workflows, auditable role approvals, and visible retention of access records after logout.
Practitioner guidance
- Implement host-level NHI discovery Inventory /etc/passwd, /etc/group, sudoers files, and authorized_keys across Linux hosts so machine identities are visible outside the directory.
- Assign accountable owners to every credential Map each service account, SSH key, and token to a current application or team, then remove credentials with no valid owner.
- Review standing sudo access on service accounts Identify NOPASSWD rules, UID 0 accounts, and broad group memberships that remain after a temporary task has ended.
Bottom line: Linux estates often contain machine identities that directory-centric governance never sees, which leaves access outside normal lifecycle control.
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28/09/2026 4:07 pm
Linux non-human identity governance is a host-level problem, not a directory problem. Directory-centric IAM was built to govern people first, then extended to machine credentials by convention. Linux estates break that assumption because the identities that matter most often live as files, keys, and service entries on the host itself. The practical conclusion is that governance has to start where the credential exists, not where the reporting model is most convenient.
A question worth separating out:
Q: What should teams do when they find orphaned Linux credentials?
A: Revoke or quarantine the credential, confirm whether any host or application still depends on it, and update the ownership record before restoring access. The goal is to remove unowned privilege without breaking the service, which requires a live inventory and a clear approval trail.
👉 Read our full editorial: Linux non-human identities create a hidden governance gap